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Mindfulness based interventions in multiple sclerosis - a systematic review
BMC Neurology volume 14, Article number: 15 (2014)
Multiple sclerosis (MS) is a stressful condition; depression, anxiety, pain and fatigue are all common problems. Mindfulness based interventions (MBIs) mitigate stress and prevent relapse in depression and are increasingly being used in healthcare. However, there are currently no systematic reviews of MBIs in people with MS. This review aims to evaluate the effectiveness of MBIs in people with MS.
Systematic searches were carried out in seven major databases, using both subject headings and key words. Papers were screened, data extracted, quality appraised, and analysed by two reviewers independently, using predefined criteria. Study quality was assessed using the Cochrane Collaboration risk of bias tool. Perceived stress was the primary outcome. Secondary outcomes include mental health, physical health, quality of life, and health service utilisation. Statistical meta-analysis was not possible. Disagreements were adjudicated by a third party reviewer.
Three studies (n = 183 participants) were included in the final analysis. The studies were undertaken in Wales (n = 16, randomised controlled trial - (RCT)), Switzerland (n = 150, RCT), and the United States (n = 17, controlled trial). 146 (80%) participants were female; mean age (SD) was 48.6 (9.4) years. Relapsing remitting MS was the main diagnostic category (n = 123, 67%); 43 (26%) had secondary progressive disease; and the remainder were unspecified. MBIs lasted 6–8 weeks; attrition rates were variable (5-43%); all employed pre- post- measures; two had longer follow up; one at 3, and one at 6 months. Socio-economic status of participants was not made explicit; health service utilisation and costs were not reported. No study reported on perceived stress. All studies reported quality of life (QOL), mental health (anxiety and depression), physical (fatigue, standing balance, pain), and psychosocial measures. Statistically significant beneficial effects relating to QOL, mental health, and selected physical health measures were sustained at 3- and 6- month follow up.
From the limited data available, MBIs may benefit some MS patients in terms of QOL, mental health, and some physical health measures. Further studies are needed to clarify how MBIs might best serve the MS population.
Multiple sclerosis (MS) is a chronic, unpredictable, and poorly understood neurodegenerative inflammatory condition . Nervous system damage can be extensive, with severe disability in both physical and cognitive realms [2, 3]. Worldwide incidence of MS is increasing, with estimates at 3.6/100,000 person-years in females and 2.0/100,000 person-years in men . MS can present in myriad different ways and carries a high degree of uncertainty, in terms of disease progression and resultant impairment [5–7]. MS characteristically falls into several different diagnostic subclassifications, depending on disease activity and stage of progression [8, 9].
MS typically follows a chronic and eventually progressive course. Consequently, health service utilisation costs accumulate and impact significantly on resource allocation . Epidemiological data from the United States, Canada, and China all highlight comorbidity as problematic [11–14], with mental health diagnoses frequently co-existing. The literature demonstrates anxiety and depression point prevalence estimates of up to 16.5% and 46%, respectively . Health related quality of life (HRQOL) is often significantly impaired in people with MS , and may be exacerbated by disease uncertainty  and depression . Mental health comorbidity is thought to be under-reported in people with MS [15, 17] and is associated with diminished treatment adherence, increased somatic symptoms, and impairment of both functional ability, and social status . As in many chronic illnesses, self-efficacy is of importance in people with MS. Enhanced feelings of control and acceptance may lessen the psychological and emotional impact of living with a chronic condition, and contribute to improvements in clinical status, such as diminished fatigue [19, 20].
Psychological distress may contribute to MS disease activity , and a growing body of research evidence examines this hypothesis [22, 23]. Cognitive behavioural therapy (CBT) has already been found to impact positively upon psychological stress  and pathological neuroimaging markers; the short term effect size for such CBT interventions has been shown in one study to rival that of certain disease modifying pharmacological agents .
Mindfulness based interventions
Mindfulness practices originate from ancient Buddhist meditation techniques, but have since been secularised, manualised, and appropriated for use in a diverse range of clinical settings. Jon Kabat-Zinn, who introduced Mindfulness techniques to the West in the nineteen eighties, has defined Mindfulness as: ‘..paying attention in a particular way: on purpose, in the present moment, and nonjudgementally’ . The original research studies on Mindfulness focussed on chronic pain, but Mindfulness-based interventions (MBIs) have become increasingly popular in various areas of chronic disease management over the last 30 years. Group-oriented, Mindfulness Based Stress Reduction (MBSR) is the most well researched MBI approach and has been applied in the management of: anxiety, chronic pain, depression, and stroke [26–29]. MBSR appears to have neuroendocrine, immunological and neuroplastic effects, although research in this area remains explorative in nature [30–33]. MBSR classically consists of instruction in three meditation techniques, namely breath awareness, body awareness, and dynamic yoga postures (mindful movement)  taught in groups over 8 weeks. Mindfulness Based Cognitive Therapy (MBCT) is a derivative of MBSR, with a greater emphasis on cognitive techniques, designed for specific mental health conditions such as recurrent depression .
Why is it important to undertake a review of MBIs?
The mitigation of stress is proposed as a means to actively manage and reduce pathological disease activity in people with MS . Indeed, a CBT intervention has already demonstrated efficacy, reducing gadolinium lesion enhancement on neuroimaging during the active period of treatment. However, this effect is not sustained on cessation of therapist input . MBIs are thought to operate in a different manner to CBT  and might have a more sustained effect, given the strong emphasis on regular self-practice. To date and as far as we are aware, no systematic review of the evidence for MBIs in people with MS has been published. This paper aims to evaluate the effectiveness of MBIs in people with MS.
In May 2013 a systematic search for published and unpublished studies was conducted in six major electronic bibliographic databases: Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, CINAHL, Allied and Complementary Medicine Database, and PsycInfo. To identify any additional published and/or unpublished trials, we also searched ProQuest Dissertations & Theses Database and contacted MS/mindfulness researchers. Selected medical subject headings were combined with key words relating to MS and mindfulness to create a search strategy which was finalised for use in MEDLINE (see Additional file 1) and amended for use in the other databases, using appropriate controlled vocabulary, Boolean operators, and search symbols. Delimiters were: dates searched (1980–2013); research subjects (human); and language (English). The search included the grey literature, using reference lists and citation searching from reviews and published trials, the Science Citation Index, and also involved consulting noted experts in the field. Endnote was used to store and manage the results of the database searches.
Studies were selected for inclusion using criteria related to the Study design, Participants, Interventions, and Outcomes model (SPIO). SPIO is an adapted version of PICOs (Population, Interventions, Comparison, and Outcomes) . Any definite diagnosis of MS in an adult (>18 years) was acceptable for inclusion in the review. MBIs can vary by both name and range of ingredients; therefore a core content of: breath awareness, body awareness, and mindful movement, comparable to that of the standardized MBSR, was decided upon as a pre-requisite for inclusion. MBSR was chosen as it represents the original model introduced by Jon Kabat-Zinn in the nineteen eighties, which has been widely described and researched since its inception. Perceived stress was the primary outcome measure sought. Secondary outcome measures included: mental health, physical health, psychosocial measures, as well as health care utilisation.
Selection of papers for inclusion
The bibliographic records identified by the searches were screened for relevance using broad inclusion criteria, i.e. ‘multiple sclerosis’ and ‘mindfulness’. All relevant papers were then screened, using the SPIO inclusion criteria (Table 1), to select eligible papers. All selected papers were subject to methodological appraisal. As the search yielded low numbers, a decision was made not to exclude studies solely on the basis of poor methodological quality. Screening methods were based on the Systematic Reviews guidance outlined in the Centre for Reviews and Dissemination (CRD) . Methodological issues are discussed below and reported in the evidence table (Table 2).
Risk of bias was assessed using the Cochrane Collaboration’s assessment tool  to summarise the risk of bias for major outcomes. The evidence for each individual outcome was graded as low, unclear, or high risk. This included assessing for evidence of: sequence generation; allocation concealment; blinding of participants, personnel and outcome assessors; incomplete outcome data; selective outcome reporting; and any other sources of bias.
The authors developed a data extraction tool, adapted from a previous systematic review examining the benefits of MBIs following transient ischaemic attack and stroke . The data extracted included information on study design and methodology, the populations under review, the interventions being employed, and the outcomes recorded in each study. Two reviewers working independently carried out screening and data extraction. Broad screening was undertaken by RS and SB; narrow screening by RS and JB. Any disagreements were adjudicated via a further reviewer (SM).
As the results of the search and review were heterogenous, findings are presented in a narrative format. It was not possible to undertake a meta-analysis.
The search of the databases retrieved 1,049 records. Following screening (Figure 1), 3 papers were considered eligible for inclusion in the review: Grossman et al. , Mills and Allen , and Tavee et al. . See Additional file 2 for details of papers excluded by narrow screening. Further information on study findings was sought from authors Mills and Allen  and Tavee et al. , but no responses were received.
The three studies originated from Wales (Mills and Allen ), Switzerland (Grossman et al. ), and the United States (Tavee et al. ). Grossman et al.  and Mills and Allen  conducted randomised controlled trials (RCT), while Tavee et al.  reported a non-randomised controlled trial. None of the studies compared MBIs against an active intervention. Grossman et al.  recruited from Neurology out-patients, and conducted the study in a university hospital setting, as did Tavee et al. . Mills and Allen  recruited from a mixture of General Practitioner and Physiotherapist referrals.
Across the studies, there was a total of 183 participants. Attrition was variable. Grossman et al.  described remarkably low attrition rates (5%) and a high attendance rate (92%), whilst Mills and Allen  reported drop out rates of 12.5% and cited reasons such as bereavement and dislike of Tai Chi style exercises. Tavee et al.  had the highest attrition of all (43%), and cited issues such as transportation and a lack of interest.
Tavee et al.  presented results for a mixed study population i.e. people with MS and patients with Peripheral Neuropathy. As we were unable to obtain MS-only data, this limited interpretation of their findings. Grossman et al.  collected data at 3 points (pre- and post- intervention, and at 6-month follow up), while Mills and Allen  recorded data at pre-, post- and 3 months after the intervention. Tavee et al.  only recorded data at pre- and immediately post-intervention. See Table 2 for details.
Grossman et al.  delivered an intervention closely mapped to MBSR. Mills and Allen  and Tavee et al.  used less standardised versions, introducing elements of Tai Chi and Qi Gong. However, all three studies were broadly comparable in content, with all three emphasising mindful breath awareness, mindful movement, and body awareness or ‘scanning’. The MBIs were group based in 2 of the studies, but the Mills and Allen  intervention was delivered one to one.
Grossman et al.  used certified and experienced MBI teachers to deliver the MBI over 8 weekly 2.5 hour sessions, with a 7 hour session at week 6. They emphasised mindfulness practices in the sitting, lying and yoga asana postures, and also encouraged ‘homework’ practices for 40 minutes daily. They were the only investigators to record homework practice times. Tavee et al.  delivered a 4 hour introductory group session, followed by 8 weekly 1.5 hour classes, with a Buddhist Monk teaching all of the course components, including Samatha meditation (sitting and observing the breath), and mindful movement in the form of Tai Chi/Qi Gong and walking meditation. Tavee et al.  encouraged home practice, but did not record frequencies. Mills and Allen  delivered six individualised sessions in which unspecified teachers taught mindful movement with Tai Chi/Qi Gong, with breath and posture awareness, whilst encouraging participants to cultivate compassionate feelings towards themselves. Mills and Allen  also provided self study material, but did not report on participant uptake and usage by participants. Please see Table 2.
None of the studies provided data regarding ethnicity of participants. Across the three studies, 80% (n = 146) of participants were female, and the mean (SD) age of the total sample (n = 183) was 48.6 (9.4) years. Data regarding socioeconomic status was generally not well reported; for example, Mills and Allen  provided data on only half of their study population, of whom, 50% were in employment. Grossman et al.  recorded number of years in education. Disease phenotype was described in two of the studies; however, Tavee et al.  simply described participants (n = 17) as having any diagnosis of MS. From the remaining 166 patients where a phenotype could be discerned, 123 (67%) had a diagnosis of relapsing remitting MS, and the other 43 (25%) were diagnosed with secondary progressive MS. All three studies excluded patients with significant cognitive impairment, as well as those with severe physical disability, according to either the Expanded Disability Status Scale being >6 (requiring 2 walking aids i.e. a pair of canes, crutches, etc. - in order to walk about 20 meters, without resting), or more generally, being unable to make their own way to the hospital (Mills and Allen ). See Table 3.
The primary outcome sought by this review (perceived stress) was not reported in any of the studies. However, secondary outcomes of interest included: anxiety, depression, HRQOL, concentration, fatigue, vitality and general wellbeing. No information was available on economic parameters, such as cost/benefit analysis for patients, or health service utilisation. Please see Table 2.
Mental health outcomes
Grossman et al.  measured anxiety directly with the Spielberger Trait Anxiety Index (STAI), demonstrating significant reduction immediately post completion in both whole intervention group and in further subgroup analyses of those with evidence of pre-intervention impairment. This was maintained at six-month follow up in overall group and subgroup analyses. Mills and Allen  included data on change in anxiety scores via a general MS symptom checklist, and the Profile of Mood States (POMS), reporting non-significant change. Please refer to Table 4.
Two studies assessed the effect of MBIs on depression. Grossman et al.  used the Center for Epidemiological Studies Depression (CES-D) scale, reporting significant reductions in both whole intervention group and subgroup analyses of those with pre-intervention impairment at intervention completion. This was maintained at six-month follow up in the overall group and in subgroup analyses. Mills and Allen  also reported a significant change using the POMS scale. See Table 4.
Mills and Allen  reported preferentially on physical measures, opting to focus on single-leg standing balance, with significant improvement noted at both study completion and at three-month follow up, although one participant’s data was missing for this latter calculation. Please see Table 5.
All three studies measured the effect of MBIs on fatigue. Scores on the Modified Fatigue Impact Scale (MFIS) were significantly reduced in the study by Grossman et al.  at both intervention completion in the overall population, as well as in subgroup analyses of those with pre-intervention impairment. Beneficial effect was maintained in the overall group at six-months, as well as in those with pre-intervention impairment. Tavee et al.  also reported significant change on MFIS at study completion. Fatigue was non-significantly reduced on POMS in the Mills and Allen  study see Table 5.
Grossman et al.  measured both disease-specific (Hamburg Quality of Life Questionnaire in Multiple Sclerosis; HAQUAMS) and generic HRQOL (Profile of Health-Related Quality of Life in Chronic Disorders; PQOLC), with PQOLC being significantly improved at study completion in the overall group and in subgroup analyses for those with pre-intervention impairment, as well as at six-month follow up in overall group and in subgroup analyses. Similarly, HAQUAMS was significantly improved at completion in the overall group and in subgroup analyses in those with pre-intervention impairment, as well as at six-month follow up in overall group and subgroup analyses. Mills and Allen  report an overall trend towards general symptom improvement, but did not justify this statistically. Tavee et al.  did not report population-specific results for the Short Form-36 (SF-36). See Table 6.
Methodological quality of included papers
Quality was assessed using the Cochrane Collaboration tool for Risk of Bias . Of the 3 studies, only Grossman et al.  adequately describe evidence of sequence generation at the randomisation stage. Allocation concealment was most convincingly implemented by Grossman et al. , where the investigator was fully blinded to patient information, but this was not clearly described by Mills and Allen ; Tavee et al.  appear to have collected a control group independently of those expressing a desire to take part in the intervention group. Only Grossman et al.  described blinding of outcome assessors. All three authors described incomplete outcome data, including attrition rates, but only Grossman et al.  included this intention to treat and attrition data in the statistical analysis. There was no substantive evidence for selective outcome reporting in any of the studies, although Mills and Allen  omitted data on mood recording via Profile of Mood States (POMS), which is described elsewhere . Overall, only the study by Grossman et al.  can be considered of high methodological quality (see Table 7).
This systematic review on the use of MBIs in people with MS identified three studies eligible for inclusion, which were varied in nature, with only one of the studies being adequately powered to calculate meaningful effect sizes (n = 150). Attrition rates across the studies were variable, and the reasons for this are unclear. The MBIs used in the studies were heterogenous. Two papers described a protocol comparable to MBSR, but stemming from Qi Gong practices; the other study closely resembled a more standardised version of MBSR . Two of the interventions were applied in a hospital based group setting; one was individualised and delivered one to one in patients’ homes. There were a variety of measures of interest recorded. However, none of the studies focussed on our primary outcome of interest: perceived stress.
Results from the three studies are encouraging in the domains of mental health and HRQOL. Improvements in HRQOL, anxiety, depression, and fatigue remained statistically significant at six-month follow up in the Grossman et al.  study, albeit with diminished effect sizes; standing balance remained significantly improved at three-month follow up in the Mills and Allen  study. There were no adverse events reported.
Strengths of this review
This review employed a rigorous methodological strategy to search and appraise the research literature involving MBIs in people with MS. Three reviewers were involved in the screening and appraisal of studies suitable for inclusion, with further discussion taking place, as required. Quality was assessed in accordance with the Cochrane Collaboration guidance.
Limitations of this review
The fact that MBIs originate from ancient oriental traditions may bias the results, in that, due to resource constraints, our review was limited to papers published in English. The low methodological quality of two studies, and the overall heterogenous nature of the studies, precluded quantitative meta-analysis.
Strengths and limitations of the included papers
Grossman et al.  produced a well designed RCT, with adequate numbers being included to allow power calculations. Their strict inclusion/exclusion criteria, and widely recognisable form of MBI, delivered by experienced, certified trainers, with pre-post and three-month follow up measures being collected, allows a degree of confidence when reviewing their findings. Mills and Allen  and Tavee et al.  conducted studies that were of lower methodological quality, with small sample sizes, and less well-defined intervention standards. There was no randomisation employed by Tavee et al. . Comparing all three studies, there is considerable heterogeneity with respect to populations, interventions and outcome measures, and almost no meaningful information on the effects on different socioeconomic groups. Limited information was provided regarding different disease phenotypes and ‘stages’ of illness. Furthermore, little evidence is available about economic costs/benefits of the MBIs in this group, making drawing conclusions about any individual MBI technique in this population in general problematic. As such, these results should be treated with caution.
Implications for research
Future studies of MBIs in people with MS should be of a larger scale, employing robust methodological techniques. They should examine physical and psychological measures; different disease phenotypes, at various defined stages of disease progression, of varied functional status; and should address important questions around feasibility, acceptability and appropriateness in diverse ethnic groups; as well as economic concerns such as health care utilisation and cost effectiveness. For specialist groups, such as people with MS, it may be worth examining whether having classes run by specialist trainers’ (i.e. health professionals) rather than ‘generic’ MBI trainers has any specific advantages/benefits.
Correlating findings with neuropsychological, biomarker and clinical imaging evidence would also be very informative. Given the widely varying attrition rates reported, qualitative research should also be employed to gather information on the broad acceptability of MBIs from the perspective of people with MS. Such research could also explore perceived stress and self-efficacy, as discussed previously.
Implications for practice
MBIs may have utility in the MS clinical population, particularly for mental health conditions, such as anxiety and depression, as well as physical function. There is no overt evidence of harm.
Although the evidence is limited, this review indicates that MBIs can hold benefit for people with MS, specifically in terms of quality of life, mental health, and some physical aspects of the condition. It is unclear at this time whether these results are generalisable to different ethnic groups; both genders; all age groups; different disease phenotypes; and diverse socio-economic groups. There is no evidence regarding health service utilisation costs. It also remains unclear what benefit MBIs may hold for people with more advanced MS. Further high quality studies are needed to clarify the feasibility, practicality, acceptability, health and psychosocial benefits of MBIs for people with MS.
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The authors declare that they have no competing interests.
This systematic review was conceived by RS, SM, FM, ML and JB. RS registered this project with PROSPERO and took the lead for the review. RS conducted all database searches. RS, SB and JB carried out the screening of studies identified on database searching. RS authored the manuscript, whilst SM, FM, ML and JB all provided critical review and input into manuscript writing. All authors read and approved the final manuscript.
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Simpson, R., Booth, J., Lawrence, M. et al. Mindfulness based interventions in multiple sclerosis - a systematic review. BMC Neurol 14, 15 (2014) doi:10.1186/1471-2377-14-15
- Multiple sclerosis
- Stress management